Hey Dakka,
I've started painting some necrons with a ceramic look, my problem isn't the armour which is grey up to off white, the joints, weapons and some other parts will be painted black, but the issue I'm having is the eye and Gauss weapon "Glow" colour.
Here's where I'm at with them so far:
I want the glow colour to stand out. Initially I'd planned to use a fairly bright green something like VGA Scorpion green (along with a more bone / rusted look to the armour), but since I switched from white/bone to ceramic white/grey I don't think it'd stand out enough due to how bright the main armour is. Now I could paint the heads, weapons ,and everything else that directly comes into contact with the bright light green, black giving a hard break, But i'm unsure that would work in every circumstance.
The colours that I've used so far are fairly neutral VGA: Grey Primer, light grey with a zenithal highlight of VMC off white. I could still use a bit of rust on the joints for contrast.
Should I go for cooler shades and build up to warm highlights or visa-versa? swap out green for, maybe, blue or purple?
I have no idea what I'm doing.